Enevhar Aldarion
Hero
Did anyone mention yet that you do not even have to do damage to trigger the necrotic damage? All it takes is a successful attack role, as was confirmed a few years ago in Sage Advice. You can Hex a creature, make a successful attack role to catch it in a net, and the extra damage will trigger. So you do not even have to physically injure that chicken or mouse or whatever and just watch the bonus damage kill it for you.